Premiere not showing RED-Files (R3D) as shot on iMac (AMD Radeon 9).

We're again experiencing that Premiere is suddenly mirroring and rotating our Red-files. It's a huge problem since we have to send ProRes masters to grading and vfx.

It started with the CC2019-update and we were able to fix it by adjusting the project to only Metal or/and software only rendering. - This is NOT working anymore, and the only way to fix our timelines is to rotate and vertical flip every single clip.

This is really frustrating - what to do?!